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Grady,
The 101mm dimension is for early 930 transmissions, from the "Turbo Carrera" manual, page 39-17. Yes, that would be added to 15.95 for your "b" dimension in green. The ball on the extension tip is 10mm, so subtract 5mm for the actual measuring distance.
The original 915 manual shows the 901 backlash tool P259 being used, but I question how accurate that can be. The 915 ring gear is larger than a 901 ring gear. The P259 bracket was designed for use on Nadella flanges, and doesn't register on any CV flange. If using the 901 bracket on a 915, it should at least be modified for a different indicating point. The manual recommends doing this to the 905 tool for a 925, but doesn't to the 901 tool.
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Jon B.
Vista, CA
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